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NI'I'ED STATES i u o,

JOSHA K'. ING ALLS, OE' BROOKLYN, NEW YORK, ASSIGNOR 'I'O M. I-l.HOWELL, OF NEW YORK, N. Y.

IVIIEITAI: BEAlVI.

Specication of Letters Patent No: 15,118, dated June 10, 18:56;

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Be it known that I, JOSHA K. INGALLS, of the city Of Brooklyn, county ofKings, and State of New York, have invented a new and useful Method ofConst-ructing or Making Metal Beams, and I hereby declare the followingto be a full and clear description of the same, reference being had tothe accompanying drawings, making a partof this specification, in which-Figure 1, represents a side view in perspective, Figs. 2 and 3, sideelevations.

A is a top flanch; B, a corrugated web, and 0 a bottom flanch, t-russ,or tie, and 66 is across tie or bolt, and Z) is a cross section.

It has long been known that cast iron possesses in the ratio of cost of1naterial one requisite of strength even in a superior degree to wroughtiron, while it-s capacity to fesist tension is greatly inferior. Now, asin any beam, the top port-ion is compressed and the bottom portionstrained, by any load, t should appear that the top flanch ought to bemade of cast iron and the bottom flanch of wrought iron. But heretoforeno successful method has been found of trussing cast iron beams,inasmuch as the intlexible nature of the cast iron and the more yieldingqualities Of the wrought iron caused the cast iron to be ruptured beforethe wrought iron had come to its full ten- Sion.

The nature of my invention consists in furnishing any 1netal beam, witha web corrngated in its length, in such a manner as to unite the topflanch, or strut, or arch, with the bottom flanch, or truss, or tie.

To enable others Skilled in the use Of iron for similar purposes to makemy beam, I will further describe my method.

First, I make a cast iron beam with top flanch, A, and corrugated web Bas shown in Fig. l, said corrugations having the greatest lateral extentat the bottom, and receding toward the top, until the web becomes nearlyor quite straight, where it att-aches to t-he top ianch. The ends ofthis beam I provide with stout flanches cast;

upon the bottom of the web, with grooves to receive the T beads of thewrought iron tie, as shown at T. I then provide a wrought iron bottomiianch or tie, 0, and secure the ends with T heads in the cast iron endflanches in a manner similar to that in which the bow string beam incommon use, is made, or by bolts or any other convenient 1nethod. I thenfurther secure the top and bottom flanches, by means of bolts or ties,CLA, CL.' Also, I make a beam as shown by Fig'. 2 with the top flanchand web of cast iron as above described, the web on the bottom beingterminated by an inverted arc, parabolic or catenary line, and furnishedwith a wrought iron truss as shown. Again, I make the beam entirely ofcast metal, making t-he corrugations extend 1nost in width in the middleof t-he web, and receding to right lines at top and bottom where itattaches to the flanches, as shown in Fig. 8.

The advant-ageof my invention consists in the corrugated web, whichenables me to combine the cast and wroughtmaterials in such a manner asto cause them to act simultaneously in every moment of depression, untilthe one is orushed or the other broken. The flexibility of t-hecorrugated web allows the cast metal to yield until the wrought iron isbrought to its full tension, the form atthe same being much bettercalculated to secure t-he beam from collapsing or tearing, and cantherefore be made much lighter than the ordinary rigid web. It enablesme to overcome the difficulty heretofore experienced, in Shrinking onthe ties to cast iron beams, by which means a considerable portion ofthe strength of the materials is exhausted before it receives any loadat all.

Having therefore described my invention, I am aware that a wrought ironbeam has been 1nade with wronght iron, corrugated web, said corrugationsresisting compression in the direction of their length I do nottherefore claim that, but

lVhat I do claim and desire to secure by Letters Patent is- 1. Thecorrugated web, when cast with Or upon the top flanch, and arranged withthe bottom flanch or tie, in such manner as to afford flexibility to thecast portion of the beam, to accommodate its action to the tension Ofthe wrought portion, in the manner set forth.

2. I claim the tapering form Of the cor- 5 rugations in their height,which gives a right Iine, where the web attaches to the top flanch withwhich t ELCtS in resisting comression; and which increases the breadthOf said corrugations, and consequently the flexibility Of the web, wheret touches the 10 bottom ianch Or tie, with which t acts in resistingextension.

JOSHA K. INGALLS. VVitnesses:

J. N. RAPPLIEYEA, GEORGE LANG.

